Viridiana (1961)

A man drugs a woman and then partially undresses her in her bed while she sleeps. He kisses her bare chest. No explicit nudity is shown (her breasts are partially covered).

A man deceives a woman to come behind a couch during a party, and then forces himself upon her. Feet are shown from behind the couch. No nudity, but it is clear what is occurring.

A woman enters upon two men striking another, when one forces himself upon her and attemps to rape her. No nudity shown.